CN105005142A

CN105005142A - Small-distortion handheld binocular telescope

Info

Publication number: CN105005142A
Application number: CN201510412043.5A
Authority: CN
Inventors: 陈婷; 薛文慧; 谢婧; 邱成波; 范志刚
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2015-05-26
Filing date: 2015-07-15
Publication date: 2015-10-28
Also published as: CN104834083A

Abstract

The invention discloses a small-distortion handheld binocular telescope which is composed of an object lens, a turning prism and an ocular lens. Visible light information which is transmitted from a target is focused by the object lens and generates a vertically inverse size-reduced real image. The vertically inverse real image is turned to an upright image through the turning prism. The obtained real image is changed to an upright size-enlarged virtual image which is generated in a distinct vision distance of human eyes, and is received and observed by human eyes. The small-distortion handheld binocular telescope of the invention is developed for realizing small-distortion imaging of the visible light. The core design of the small-distortion handheld binocular telescope is a distortion-eliminating ocular lens system for obtaining a large-viewing-field small-distortion target image. The small-distortion handheld binocular telescope can realize a small distortion of which the absolute value is smaller than 5% in viewing the target object, so that the human eyes cannot become aware of the distortion of the image, thereby realizing a good observation effect.

Description

The hand-held prestige binoculars of little distortion

Technical field

The invention belongs to visible optical systems design area, relate to a kind of hand-held prestige binoculars.

Background technology

Telescopic system is a kind of optical system for observing distant object, and corresponding visual instrument is called telescope.Owing to being greater than the directly perceived subtended angle of object to eyes itself by the subtended angle of telescope optical system imaging to eyes, utilizing telescope can be more clearly visible the details of object, expand the ability of the remote object of eye-observation.Telescope optical system is widely used in national product sphere of life and military field, such as: astronomical observation, tourism, match viewing, navigation, sentry post warning, submarine are dived and hoped etc.

Recent years, there is new trend in the development of telescope technology.Also diversification more in using function, such as: steady picture function, temporald eixis function, precise distance measurement function, automatic focusing function etc., and also greatly improves in adaptive capacity to environment.

The telescope parameter of at present more common on the market every country is more consistent, magnification at 7 ~ 20 times, 5 ° ~ 7.4 °, full filed angle, exit pupil diameter 2.5 ~ 7.1mm.Because eyepiece system field angle is comparatively large, distortion aberration becomes cube relation with the size of field angle, and therefore visual system limits the distortion of total system, and full filed distortion absolute value is generally within 10%.

Summary of the invention

The object of this invention is to provide the hand-held telescopic optical system of a kind of little distortion, application native system object observing object can reach the distortion that absolute value is less than 5%, and making human eye can not discover picture has distortion, reaches good observing effect.

The object of the invention is to be achieved through the following technical solutions:

The hand-held telescopic optical system of a kind of little distortion, by object lens, prism and eyepiece is turned to form, the real image that the visible ray information that target sends becomes handstand to reduce after object lens focus on, make inverted real image upright by turning to prism, gained real image images in the virtual image of the upright amplification at human eye distance of distinct vision place finally by eyepiece group, received observe by human eye.

In the present invention, described target is positioned at infinite point.

In the present invention, described in turn to prism to be general sieve type prism, two pieces of right-angle prism spacing of every Pro type prism are not 0.

In the present invention, described eyepiece is the orthoscopic eyepiece structure of amendment.

In the present invention, on the orthoscopic eyepiece architecture basics using full filed 40 °, increase eyeglass amendment structure, use full filed to expand to 60 °.

In the present invention, object lens, turn to prism and eyepiece in actual production, have two groups, two groups of object lens, turn to the structure of prism, eyepiece about plane symmetry.

In the present invention, being suitable for target source wave band is visible light wave range.

The hand-held telescopic optical system of little distortion provided by the invention is developed for realizing the little distortion imaging of visible ray, and its core design is orthoscopic eyepiece system, to obtain the target image of Large visual angle, little distortion.Compared to prior art, tool has the following advantages:

1, can be used in the target of visible light wave range 0.486 μm of < λ <0.656 μm;

2, can complete object space full filed ω=± 3.25 °, magnification Γ=10 ×, Entry pupil diameters Do=40mm, emergent pupil is full of the picture of human eye entrance pupil apart from 16mm;

3, comparatively simple structure can be used enough to produce the little distorted image of distortion absolute value <5%;

4, system dimension is less, can carry with.

Accompanying drawing explanation

Fig. 1 is the structural representation of the hand-held telescopic optical system of little distortion;

Fig. 2 is the structural drawing of the hand-held telescopic optical system of little distortion.

Embodiment

Below in conjunction with accompanying drawing, technical scheme of the present invention is further described; but be not limited thereto; everyly technical solution of the present invention modified or equivalent to replace, and not departing from the spirit and scope of technical solution of the present invention, all should be encompassed in protection scope of the present invention.

As shown in Figure 1-2, the hand-held telescopic optical system of little distortion provided by the invention by object lens 1, turn to prism 2, eyepiece 3 forms.Visible-range image object is positioned at infinite distance, the parallel wave sent by image object through 1 one-tenth, object lens inverted real image near objective lens focal plane, light is upright by turning to prism 2 to be transferred to by inverted image in this process, and reduce the entire length of system to a certain extent, picture after turning to is through the virtual image of the upright amplification of 3 one-tenth, eyepiece and human eye distance of distinct vision place, eyepiece 3 uses based on orthoscopic eyepiece structure, revises its structure and reaches little distortion picture element, eventually pass through eye-observation to image object.

In said system, because single lens objective aberration and spherical aberration are all quite serious, the lens combination that two or more than two is commonly used by modern refracting telescope makes object lens.Wherein the most general with lens doublet application.The convex lens that it is made up of one block of crown glass of close proximity and the concavees lens that one block of flint glass is made form, completely chromatism of position is eliminated to two specific wavelength, also can correspondingly weaken when meeting certain design conditions to the chromatism of position of its commplementary wave length, also can cancellation spherical aberration and coma.Due to residual achromatic aberration and the impact of other aberrations, the relative aperture of lens doublet is less, is generally 1/15 ~ 1/20, is seldom greater than 1/7, and available fields is also little.

In said system, because doublet objective can not correct astigmatism and the curvature of field, so field angle is generally no more than 8 ~ 10 °.If there is the prism of a lot of light path after object lens, because the astigmatism of prism is contrary with the astigmatism symbol of object lens, can offset the astigmatism of a part of object lens, visual field can reach 15 ~ 20 °.

In said system, the objective system effective focal length of design is 270mm, and total length is 296.6mm.Emergent pupil, apart from being-244mm, should be noted that when pupil is connected.After the angular resolution corresponding with human eye transforms, when 8lp, except peripheral field, pass letter and reach 0.9.

The system used in said system is Kepler telescope structure.For opening Pood's telescopic system, need after object lens, add prism group or lens combination carrys out image rotation, what make to be visually observed is erect image.

In said system, the most frequently used one turns to prism to be general sieve prism (PorroPrism).Wider with the binocular of general sieve prism, the spacing of two pieces of object lens is greater than the spacing of eyepiece, and when observing near objects, stereoscopic sensation is strong like this.Some compact binocular adopts inverted general sieve prism, and the spacing of object lens is less than width between eyepiece, and stereoscopic sensation also just reduces.General sieve prism is easy to manufacture, more cheap than the roof prism of comparable optical quality.

In said system, object lens imaging becomes directional light after eyepiece, according to the reversibility of light path, and eyepiece reverse design.When the profile arrangement of telescopic system, often first according to the field angle to eyepiece and distance of exit pupil requirement select the pattern of eyepiece.

In said system, because the visual field of eyepiece is comparatively large, full filed reaches 60 °, directly calculates design difficulty larger.More feasible method be by search applicable design example for reference to carry out changes optimization.When searching suitable eyepiece initial configuration, the parameter of Main Basis is relative aperture and visual field.By comparing, initial option Ai Erfu eyepiece, Ai Erfu eyepiece is symmetrical structure, centre is convex lens, and both sides are cemented doublets of structural symmetry.After constantly optimizing trial, Ai Erfu eyepiece can provide the mtf value met design requirement, but there is larger distortion, more difficult in solution.Therefore we take another kind of goggle structure, i.e. orthoscopic eyepiece.Orthoscopic eyepiece is that one piece of plano-convex lens adds that three balsaming lenss combine.In general, orthoscopic eyepiece is applicable to the designing requirement that full filed angle is about 40 °, and designing requirement full filed of the present invention nearly 60 °, so increase a slice lens on the architecture basics of orthoscopic eyepiece, lens are between three balsaming lenss and plano-convex lens, as the initial configuration of eyepiece design, then be optimized design.

In said system, the reference eyepiece chosen is in effective focal length and enter in interpupillary distance not meet designing requirement, needs to optimize.Need the emergent pupil distance of constantly adjustment eyepiece system simultaneously when optimizing, eyepiece system emergent pupil is connected with objective system emergent pupil.Docked with eyepiece system by the two separation object lens designed, when Entry pupil diameters is 40mm, exit pupil diameter is 4mm, and last face of emergent pupil and system (human eye face) overlaps, and system magnification is-0.1.

Total system is after optimizing, and when ensureing field angle and pupil is constant, central vision to pass letter value 2 ' time, brings up to 0.5 nearly, and peripheral field distortion value is 5%, and in full filed, distortion is kept for no more 5% substantially.

Claims

1. the hand-held prestige binoculars of little distortion, it is characterized in that described telescope by object lens, turn to prism and eyepiece to form, the real image that the visible ray information that target sends becomes handstand to reduce after object lens focus on, make inverted real image upright by turning to prism, gained real image images in the virtual image of the upright amplification at human eye distance of distinct vision place finally by eyepiece group, received observe by human eye.

2. the hand-held prestige binoculars of little distortion according to claim 1, is characterized in that described target is positioned at infinite point.

3. the hand-held prestige binoculars of little distortion according to claim 1, turn to prism to be general sieve type prism described in it is characterized in that.

4. the hand-held prestige binoculars of little distortion according to claim 3, is characterized in that two pieces of right-angle prism spacing of described general sieve type prism are not 0.

5. the hand-held prestige binoculars of little distortion according to claim 1, it is characterized in that described eyepiece is the orthoscopic eyepiece structure of amendment, formed by plano-convex lens, three balsaming lenss and lens combination, lens are between three balsaming lenss and plano-convex lens.

6. the hand-held prestige binoculars of little distortion according to claim 1, it is characterized in that described object lens are lens doublet, it is visible light wave range that telescope is suitable for target source wave band.